Hi,
Yes, it could be the dimmer switch. However, first let's check to see if the fuses are good, specifically the gauge fuse.
If you look below, I attached the wiring schematic for the instrument panel lighting. I highlighted two fuses. I need you to check both. They are in the interior fuse box. Normally, I have a pic of the fuse box and fuse location. For some reason, this one isn't in the vehicle.
When checking the fuses, first confirm the fuse hasn't failed. If it is good, confirm there is power to and from it. Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
If that checks good, then I need you to next go to the dimmer switch and check for power at the light blue wire.
Let me know what you find or if you have other questions.
Take care,
Joe
See pics below. Note: I had to cut the schematic in half to make it readable for you. I did overlap them so you can follow from one to the next.
Images (Click to make bigger)
Wednesday, October 13th, 2021 AT 6:15 PM